Principal Investigator(s):Harris, Kathleen Mullan, University of North Carolina-Chapel Hill; Udry, J. Richard, University of North Carolina-Chapel Hill

Summary:

The National Longitudinal Study of Adolescent Health (Add Health) is a longitudinal study of a nationally representative sample of adolescents in grades 7-12 in the United States during the 1994-1995 school year. The
Add Health cohort has been followed into young adulthood with four in-home interviews, the most recent in 2008, when the sample was aged 24-32. Add Health combines longitudinal survey data on respondents' social,
economic, psychological, and physical well-being with contextual data on the family, neighborhood, community, schoo... (more info)

The National Longitudinal Study of Adolescent Health (Add Health) is a longitudinal study of a nationally representative sample of adolescents in grades 7-12 in the United States during the 1994-1995 school year. The
Add Health cohort has been followed into young adulthood with four in-home interviews, the most recent in 2008, when the sample was aged 24-32. Add Health combines longitudinal survey data on respondents' social,
economic, psychological, and physical well-being with contextual data on the family, neighborhood, community, school, friendships, peer groups, and romantic relationships, providing unique opportunities to study how
social environments and behaviors in adolescence are linked to health and achievement outcomes in young adulthood. The fourth wave of interviews expanded the collection of biological data in Add Health to understand the social, behavioral, and biological linkages in health trajectories as the Add Health cohort ages through adulthood. This Add Health data file measures the prevalence of alcohol outlets in respondent communities by
reporting the tract-level density of establishments possessing on- and/or off-premise alcohol licenses. Alcohol outlet licensing data was gathered from individual states from September 2006 through June 2007. The
physical address and the alcohol license category for each outlet were obtained when available. For more information, please see the study website.

Access Notes

This data collection has been deaccessioned; it is no longer distributed by ICPSR.
Additional information may be available in Data Collection Notes.

2014-06-30: This study has been deaccessioned and is no longer distributed by ICPSR or DSDR. More information on accessing Add Health restricted-use data can be found on the Add Health website.

2014-06-30: This study has been deaccessioned and is no longer distributed by ICPSR or DSDR. More information on accessing Add Health restricted-use data can be found on the Add Health website.

Methodology

Sample:
Wave I, Stage 1 School sample: Stratified, random sample of all high schools in the United States. A school was eligible for the sample if it included an 11th grade and had a minimum enrollment of 30 students. A feeder school, a school that sent graduates to the high school and that included a 7th grade, was also recruited from the community. Wave I, Stage 2: An in-home sample of 27,000 adolescents was drawn consisting of a core sample from each community plus selected special over samples. Eligibility for over samples was determined by an adolescent's responses on the In-School Questionnaire. Adolescents could qualify for more than one sample.
For this data set, a census was taken of alcohol outlets in all communities in which respondents lived.

Time Method:
Longitudinal

Mode of Data Collection:
record abstracts

Extent of Processing: ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of
disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major
statistical software formats as well as standard codebooks to accompany the data. In addition to
these procedures, ICPSR performed the following processing steps for this data collection:

Performed consistency checks.

Standardized missing values.

Checked for undocumented or out-of-range codes.

Restrictions: All data in this study are restricted and are available under a Restricted Data Use Agreement.